Fig. 5: Phonon-assisted excitation.

a PL spectrum of emitter Q3 under pulsed excitation at detuning of  −2.7 nm from the quantum emitter. The fit function on the raw data (purple) is a sum of a Lorentzian (red area) and a Gaussian (yellow area) accounting for the contribution from the ZPL and the PSB, respectively. The inset shows a simplified band diagram of an emitter as a two-level system highlighting the pumping energy detuning. b Second-order autocorrelation measurement of Q3. From the double exponential fit (red line), we extract an antibunching value of g⁽²⁾(0) = 0.053 ± 0.079. c Time-resolved PL measurement from Q3 in a semilogarithmic plot with relative double exponential fitting function with extracted time constants of τ₁ = (1.33 ± 0.04) ns (80.4%) and τ₂ = (8.31 ± 6.29) ns (19.6%). d Zoom-in of g⁽²⁾(τ) in (c) for time delays up to  ±50 ns.